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from dataclasses import dataclass


@dataclass(slots=True)
class Point:
    x: float
    y: float


@dataclass(kw_only=True)
class User:
    name: str
    age: int = 0


p = Point(1.0, 2.0)
print(f"p:{p.x},{p.y}")

try:
    p.z = 99
    print("z_set")
except AttributeError:
    print("p:slots_block")

try:
    User("Ann", 30)
except TypeError:
    print("user:positional_blocked")

u = User(name="Ann", age=30)
print(f"u:{u.name},{u.age}")

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